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首页> 外文期刊>Journal of nuclear engineering and radiation science >Numerical Investigation on Heat Transfer of Supercritical Water With a Variable Turbulent Prandtl Number Model
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Numerical Investigation on Heat Transfer of Supercritical Water With a Variable Turbulent Prandtl Number Model

机译：具有可变湍流普兰特数模型超临界水热传热的数值研究

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摘要

Turbulent Prandtl number (Pr-t) has a great impact on the performance of turbulence models in predicting heat transfer of supercritical fluids. Unrealistic treatment of Pr(t)may lead to large deviations of the prediction results from experimental data under supercritical conditions. In this study, the effect of Pr(t)on heat transfer of supercritical water was extensively studied by using shear stress transport (SST) k-omega turbulence model, and the results suggested that using the existing Pr(t)models would lead to failures in predicting the heat transfer characteristics of supercritical water under deteriorated heat transfer (dht) conditions. A new variable Pr(t)model was proposed with the Pr(t)varied with pressure, turbulent viscosity ratio, and molecular Prandtl number. The new model was validated by comparing the numerical results with the corresponding experimental data, and it was found that the new variable Pr(t)model exhibited better performance on reproducing the dht of supercritical water in vertical tubes than those of the existing Pr(t)models.
机译：湍流普朗特数（Pr-t）对湍流模型预测超临界流体传热的性能有很大影响。在超临界条件下，Pr（t）的不切实际处理可能会导致预测结果与实验数据存在较大偏差。本研究采用剪切应力传输（SST）k-omega湍流模型广泛研究了Pr（t）对超临界水传热的影响，结果表明，使用现有的Pr（t）模型将导致无法预测恶化传热（dht）条件下超临界水的传热特性。提出了一种新的变Pr（t）模型，Pr（t）随压力、湍流粘度比和分子普朗特数的变化而变化。通过将数值结果与相应的实验数据进行比较，验证了新模型的有效性，发现新的变量Pr（t）模型比现有的Pr（t）模型在再现垂直管内超临界水的dht方面表现出更好的性能。

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    Kong Xiangfei; Sun Dongfeng; Gou Lingtong; Wang Siqi; Yang Nan; Li Huixiong;

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    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China;

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